186 lines
7.5 KiB
HTML
186 lines
7.5 KiB
HTML
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<html>
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<head>
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<title>新建网页</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<meta name="description" content=""/>
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<meta name="keywords" content=""/>
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<script type="text/javascript">
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//① 绘制地图
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function Map() {
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//私有成员(不会随便发生变化)
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var w = 800;
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var h = 400;
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//成员方法，绘制地图
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this.showmap = function () {
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//创建div、设置css样式、追加给body
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var tu = document.createElement('div');
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tu.style.width = w + "px";
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tu.style.height = h + "px";
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tu.style.backgroundImage = "url(./12.jpg)";
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document.body.appendChild(tu);
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}
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}
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//② 绘制食物
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function Food() {
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var len = 20;
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//把食物(权值)坐标声明为公开的，以便在外部访问
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this.xFood = 0;
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this.yFood = 0;
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this.piece = null; //页面上唯一的食物对象
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//绘制
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this.showfood = function () {
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//创建div、设置css样式、追加给body
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if (this.piece === null) {
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this.piece = document.createElement('div');
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this.piece.style.width = this.piece.style.height = len + "px";
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this.piece.style.backgroundColor = "green";
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this.piece.style.position = "absolute";
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document.body.appendChild(this.piece);
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}
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//食物设置绝对定位(position/left/top)
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//食物位置“随机”摆放
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//移动步进值：20px
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//食物“权值”坐标： X轴(0-39) Y轴(0-19)
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//食物真实坐标：权值坐标 * 步进值
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this.xFood = Math.floor(Math.random() * 40); //0-39的随机数
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this.yFood = Math.floor(Math.random() * 20); //0-19的随机数
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this.piece.style.left = this.xFood * len + "px";
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this.piece.style.top = this.yFood * len + "px";
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}
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}
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//③ 小蛇
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function Snake() {
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var len = 20;
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this.redirect = "right"; //默认向右边移动
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//后期snakebody要变化，因此声明为公开的(每个蛇节：[x坐标，y坐标，颜色，蛇节对象])
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this.snakebody = [[0, 1, 'green', null], [1, 1, 'green', null], [2, 1, 'green', null], [3, 1, 'red', null]];
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//a.绘制小蛇
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this.showsnake = function () {
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//遍历小蛇的各个蛇节，并依次创建即可
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for (var i = 0; i < this.snakebody.length; i++) {
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//this.snakebody[i]//代表每个蛇节
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//创建蛇节div
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if (this.snakebody[i][3] === null) {//判断没有创建对应的蛇节
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this.snakebody[i][3] = document.createElement('div');
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//设置css样式(宽度、高度、颜色)
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this.snakebody[i][3].style.width = this.snakebody[i][3].style.height = len + "px";
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this.snakebody[i][3].style.backgroundColor = this.snakebody[i][2];
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//绝对定位及位置
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this.snakebody[i][3].style.position = "absolute";
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//把蛇节追加给body
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document.body.appendChild(this.snakebody[i][3]);
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}
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this.snakebody[i][3].style.left = this.snakebody[i][0] * len + "px";
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this.snakebody[i][3].style.top = this.snakebody[i][1] * len + "px";
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}
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}
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//b.移动小蛇
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this.movesnake = function () {
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//非蛇头蛇节(当前蛇节的新坐标 是"下个蛇节"的旧坐标)
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for (var i = 0; i < this.snakebody.length - 1; i++) {
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this.snakebody[i][0] = this.snakebody[i + 1][0];
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this.snakebody[i][1] = this.snakebody[i + 1][1];
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}
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if (this.redirect == "right") {
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//蛇头x坐标递增
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this.snakebody[this.snakebody.length - 1][0] += 1;
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}
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if (this.redirect == "left") {
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//蛇头x坐标递减
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this.snakebody[this.snakebody.length - 1][0] -= 1;
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}
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if (this.redirect == "up") {
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//蛇头y坐标递减
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this.snakebody[this.snakebody.length - 1][1] -= 1;
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}
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if (this.redirect == "down") {
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//蛇头y坐标递增
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this.snakebody[this.snakebody.length - 1][1] += 1;
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}
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//判断蛇头碰到食物
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//蛇头坐标
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var xSnake = this.snakebody[this.snakebody.length - 1][0];
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var ySnake = this.snakebody[this.snakebody.length - 1][1];
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//食物坐标food.xFood/food.yFood;
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if (xSnake == food.xFood && ySnake == food.yFood) {
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//吃食物增加蛇节
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var newjie = [this.snakebody[0][0], this.snakebody[0][1], 'green', null];
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this.snakebody.unshift(newjie);//把newjie放到数组的第一个位置去
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//原食物消失，重新生成一个食物
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food.showfood();
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}
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//控制小蛇在地图范围内移动
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if (xSnake < 0 || xSnake > 39 || ySnake < 0 || ySnake > 19) {
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alert('game over');
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clearInterval(mytime);
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return false;
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}
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//吃到自己判断(蛇头坐标与其他蛇节坐标一致)
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for (var k = 0; k < this.snakebody.length - 1; k++) {
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if (this.snakebody[k][0] == xSnake && this.snakebody[k][1] == ySnake) {
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alert('game over kill you by yourself');
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clearInterval(mytime);
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return false;
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}
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}
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//根据新坐标绘制小蛇
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this.showsnake();
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}
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}
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window.onload = function () {
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var map = new Map();
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map.showmap();
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food = new Food();//声明为全局的以便在该加载事件函数外部访问
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food.showfood();
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snake = new Snake();//声明为全局的snake对象
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snake.showsnake();
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//移动小蛇
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//setInterval(全局变量，时间)
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mytime = setInterval("snake.movesnake()", 200);
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//设置键盘事件，控制器小蛇移动方向
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document.onkeydown = function (evt) {
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var num = evt.keyCode;//通过事件对象获得数值码，进而知道被触发键子
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if (num == 38) {
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snake.redirect = "up";
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}
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if (num == 40) {
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snake.redirect = "down";
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}
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if (num == 37) {
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snake.redirect = "left";
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}
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if (num == 39) {
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snake.redirect = "right";
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}
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}
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}
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</script>
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<!--
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<style type="text/css">
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body {
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margin: 0;
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}
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</style> -->
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</head>
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<body></body>
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</html>
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